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प्रश्न
Give a chemical test to distinguish between the following gases.
H2 and O2
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उत्तर
| Hydrogen | Oxygen |
| Apply a burning splint to the gas: Pure hydrogen burns with a pale blue Flame when a burning splint is brought near it. | Apply a burning splint to the gas: It rekindles a glowing wooden splinter. |
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संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
State four conditions necessary for chemical reactions to take place.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
Heat may evolve or be absorbed during a ______ change.
When magnesium is burnt in the air, a new substance is formed which is ______.
Acid rain is a result of ______.
